Impeller for electric blower

ABSTRACT

Disclosed herein is an impeller for an electric blower including: an upper plate; a lower plate; and a blade positioned between the upper plate and the lower plate, wherein the lower plate includes a burring part formed at an inner diameter portion thereof to which a shaft is insertedly coupled. In addition, disclosed herein is an impeller for an electric blower including: an upper plate; a lower plate; and a blade positioned between the upper plate and the lower plate, wherein the lower plate includes a burring part formed at an inner diameter portion thereof to which a shaft is insertedly coupled and a washer part extended in a direction perpendicular to the burring part.

CROSS REFERENCE TO RELATED APPLICATION

This application claims the benefit of Korean Patent Application No. 10-2012-0056257, filed on May 25, 2012, entitled “Impeller for Electric Blower”, which is hereby incorporated by reference in its entirety into this application.

BACKGROUND OF THE INVENTION

1. Technical Field

The present invention relates to an impeller for an electric blower.

2. Description of the Related Art

Generally, an impeller for an electric blower is used in a state in which it is connected to a motor in order to suck a fluid. More specifically, an upper portion of a fan-motor for a vacuum cleaner is provided with an impeller that is a centrifugal fan for air suction, wherein the impeller is connected to a shaft of a driving motor to thereby rotate.

However, as disclosed in the following Prior Art Document, an impeller according to the prior art includes an upper plate, a lower plate, and a blade; however, the upper plate, the lower plate, and the blade are separately manufactured and then coupled to each other, such that stress due to centrifugal force and aerodynamic force is concentrated on a coupling part at the time of rotation of the impeller. Therefore, the coupling part may be damaged due to the concentration of the stress at the time of high-speed rotation of the impeller.

In addition, the impeller for an electric blower according to the prior art has a thin thickness, such that a change in inner diameter thereof is large at the time of process measurement and assembling treatment. Particularly, in the case of coupling a shaft to the impeller, abrasion occurs at a shaft coupling part of the impeller and eccentricity occurs at the time of assembling, such that a motor is driven in an unbalanced form and the coupling part is not firm, thereby deteriorating firmness and stability.

PRIOR ART DOCUMENT Patent Document

-   (Patent Document 1) JP2003-269391 A

SUMMARY OF THE INVENTION

The present invention has been made in an effort to provide an impeller for an electric blower including a burring part formed at an inner diameter portion thereof to which a shaft is coupled to allow the burring part and an outer peripheral surface of the shaft to be in contact with each other in the case in which the shaft is insertedly coupled to the impeller, such that a contact area between the shaft and the impeller increases by the burring part, thereby making it possible to prevent coupling force deterioration and unbalance due to abrasion at the time of an assembling process, simplify the assembling process, and make a coupling structure the impeller for an electric blower and the shaft more firm.

Further, the present invention has been made in an effort to provide an impeller for an electric blower including shaft coupling parts formed at an inner diameter portion thereof to which a shaft is coupled and including a burring part and a washer part to allow the burring part and an outer peripheral surface of the shaft to be in contact with each other in the case in which the shaft is insertedly coupled to the impeller, such that a contact area between the shaft and the impeller increases by the burring part', thereby making it possible to prevent coupling force deterioration and unbalance due to abrasion at the time of an assembling process and simplify the assembling process, and that a nut fixed to the shaft is supported by the washer part to allow the impeller to be implemented without a separate washer, thereby making it possible to reduce a manufacturing cost, improve productivity, and make a coupling structure between the impeller for an electric blower and the shaft more firm.

According to a preferred embodiment of the present invention, there is provided an impeller for an electric blower including: an upper plate; a lower plate; and a blade positioned between the upper plate and the lower plate, wherein the lower plate includes a burring part formed at an inner diameter portion thereof to which a shaft is insertedly coupled.

The burring part may be protruded so that the inner diameter portion of the lower plate into which the shaft is inserted stands up vertically toward the upper plate.

The shaft may be insertedly coupled to the burring part of the lower plate, and the nut may be screw-coupled to an upper end portion of the shaft so as to be positioned at an upper end portion of the burring part.

The impeller may further include auxiliary members positioned at an inner diameter portion of the impeller to which the shaft is coupled.

The auxiliary members may be coupled to both surfaces of the lower plate, having the lower plate therebetween, and an upper surface of the auxiliary member positioned on an upper surface of the lower plate may be fixed by the nut.

According to another preferred embodiment of the present invention, there is provided an impeller for an electric blower including: an upper plate; a lower plate; and a blade positioned between the upper plate and the lower plate, wherein the lower plate includes a burring part formed at an inner diameter portion thereof to which a shaft is insertedly coupled and a washer part extended in a direction perpendicular to the buning part.

The burring part may be protruded so that the inner diameter portion of the lower plate into which the shaft is inserted stands up vertically toward the upper plate, and the washer part may be extended in the direction perpendicular to the burring part so as to contact the lower plate.

The shaft may be insertedly coupled to the burring part of the lower plate, and the nut may be screw-coupled to an upper end portion of the shaft so as to be positioned at an upper end portion of the burring part.

The impeller may further include auxiliary members positioned at an inner diameter portion of the impeller to which the shaft is coupled.

The auxiliary member may be coupled to one surface of the lower plate facing the washer part.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a cross-sectional view schematically showing a state in which an impeller for an electric blower according to a first preferred embodiment of the present invention is coupled to a shaft;

FIG. 2 is a schematic exploded perspective view of the impeller for an electric blower and a shaft module shown in FIG. 1;

FIG. 3 is a cross-sectional view schematically showing a state in which an impeller for an electric blower according to a second preferred embodiment of the present invention is coupled to a shaft; and

FIG. 4 is a schematic exploded perspective view of the impeller for an electric blower and a shaft module shown in FIG. 3.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The objects, features and advantages of the present invention will be more clearly understood from the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same reference numerals are used to designate the same or similar components, and redundant descriptions thereof are omitted. Further, in the following description, the terms “first”, “second”, “one side”, “the other side” and the like are used to differentiate a certain component from other components, but the configuration of such components should not be construed to be limited by the terms. Further, in the description of the present invention, when it is determined that the detailed description of the related art would obscure the gist of the present invention, the description thereof will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

FIG. 1 is a cross-sectional view schematically showing a state in which an impeller for an electric blower according to a first preferred embodiment of the present invention is coupled to a shaft; and FIG. 2 is a schematic exploded perspective view of the impeller for an electric blower and a shaft module shown in FIG. 1.

As shown in FIGS. 1 and 2, the impeller 100 for an electric blower includes a shaft 200 insertedly coupled to an inner diameter portion thereof, whereby the shaft 200 is fixedly coupled to the impeller 100 by a nut 300.

To this end, an upper end portion of the shaft 200 is formed with a screw coupling part 210 at which a screw thread is formed, and the nut 300 is coupled to the screw coupling part 210 of the shaft 200 in a state in which the shaft 200 is inserted into an inner diameter portion of the impeller 100, such that the shaft 200 is fixedly coupled to the impeller 100.

Further, in order to improve firmness at a coupling part between the shaft and the impeller, the impeller 100 for an electric blower may further include auxiliary members 400 positioned at the inner diameter portion of the impeller 100 to which the shaft is coupled.

More specifically, the impeller 100 for an electric blower is configured to include an upper plate 110, a lower plate 120, and a blade 130 positioned between the upper plate 110 and the lower plate 120.

In addition, the lower plate 120 includes a burring part 121 formed at an inner diameter portion thereof to which the shaft 200 is coupled, as shown in more detail in an enlarged view of FIG. 1. The burring part 121, which is to increase a contact area with the shaft 200 to make management of concentricity easy and improve firmness in the case in which the shaft 200 is insertedly coupled thereto, is protruded so that the inner diameter portion of the lower plate into which the shaft is inserted stands up vertically toward the upper plate 110.

In addition, the shaft 200 is insertedly coupled to the burring part 121, and the nut 300 is screw-coupled to the screw coupling part 210 positioned at the upper end portion of the shaft 200 so as to be positioned at an upper end portion of the burring part 121.

Further, the auxiliary members 400 are coupled to both surfaces of the lower plate 120 of the impeller 100 for an electric blower to which the shaft is inserted, having the lower plate 120 therebetween. Further, an upper surface of the auxiliary member 400 positioned on an upper surface of the lower plate 120 is supported by the nut 300.

The impeller 100 for an electric blower according to the first preferred embodiment of the present invention includes the burring part 121 formed at the inner diameter portion thereof to which the shaft 200 is coupled to allow the burring part 121 and an outer peripheral surface of the shaft to be in contact with each other in the case in which the shaft is insertedly coupled to the impeller 100, such that a contact area between the shaft 200 and the impeller 100 increases by the burring part 121, thereby making it possible to prevent coupling force deterioration and unbalance due to abrasion at the time of an assembling process, simplify the assembling process, and obtain a more firm coupling structure between the impeller for an electric blower and the shaft.

FIG. 3 is a cross-sectional view schematically showing a state in which an impeller for an electric blower according to a second preferred embodiment of the present invention is coupled to a shaft. As shown in FIG. 3, the impeller 100′ for an electric blower is different only in a coupling part with a shaft from the impeller 100 for an electric blower according to the first preferred embodiment of the present invention shown in FIG. 1.

More specifically, the impeller 100′ for an electric blower includes a shaft 200 insertedly coupled to an inner diameter portion thereof, whereby the shaft 200 is fixedly coupled to the impeller 100′ by a nut 300.

To this end, an upper end portion of the shaft 200 is formed with a screw coupling part 210 at which a screw thread is formed, and the nut 300 is coupled to the screw coupling part 210 of the shaft 200 in a state in which the shaft 200 is inserted into the impeller 100′, such that the shaft 200 is fixedly coupled to the impeller 100′.

In order to improve firmness at a coupling part between the shaft and the impeller, the impeller 100′ for an electric blower may further include an auxiliary member 400 positioned at the inner diameter portion of the impeller 100′ to which the shaft is coupled.

Here, only a signal auxiliary member 400 may be provided and mounted so as to be supported at a lower portion of the impeller 100′, unlike a shaft coupling structure of the impeller 100 for an electric blower according to the first preferred embodiment of the present invention. The reason is that a washer part 121 b′ of a shaft coupling part formed at the inner diameter portion of the impeller 100′ to which the shaft 200 is coupled also serves as an auxiliary member.

More specifically, the impeller 100′ for an electric blower is configured to include an upper plate 110′, a lower plate 120′, and a blade 130′.

In addition, the lower plate 120′ includes shaft coupling parts 121 a′ and 121 b′ formed at an inner diameter portion thereof to which the shaft 200 is coupled, as shown in more detail in an enlarged view of FIG. 3. In addition, the shaft coupling part includes the burring part 121 a′ and the washer part 121 b′.

In addition, the burring part 121 a′, which is to increase a contact area with the shaft 200 to make management of concentricity easy and improve firmness in the case in which the shaft 200 is insertedly coupled thereto, is protruded so that the inner diameter portion of the lower plate 120′ of the impeller 100′ for an electric blower into which the shaft is inserted stands up vertically toward the upper plate.

Further, the washer part 121 b′, which serves as a washer in the case in which the nut 300 is coupled to the screw coupling part 210 of the shaft 200, is formed to be extended in a direction perpendicular to the burring part 121 a′ standing up so as to contact the shaft.

In addition, the washer part 121 b′ is positioned so as to contact the lower plate and has the nut 300 positioned thereon in the case in which it is fixed by the nut 300.

Further, the washer part 121 b′ may be formed by compressing an end portion of a protruded burring part.

Further, the auxiliary member 400 is coupled to one surface of the lower plate facing the washer part 121 a′.

The impeller 100′ for an electric blower according to the second preferred embodiment of the present invention includes the shaft coupling parts formed at the inner diameter portion thereof to which the shaft 200 is coupled and including the burring part 121 a′ and the washer part 121 b′ to allow the burring part 121 a′ and an outer peripheral surface of the shaft to be in contact with each other in the case in which the shaft is insertedly coupled to the impeller 100′, such that a contact area between the shaft 200 and the impeller 100′ increases by the burring part 121 a′, thereby making it possible to prevent coupling force deterioration and unbalance due to abrasion at the time of an assembling process and simplify the assembling process, and that the nut fixed to the shaft is supported by the washer part 121 b′ to allow the impeller to be implemented without a separate washer, thereby making it possible to reduce a manufacturing cost, improve productivity, and obtain a more firm coupling structure between the impeller for an electric blower and the shaft.

As set forth above, with the impeller for an electric blower according to the preferred embodiments of the present invention, the upper plate is coupled to the lower plate formed integrally with the blade, thereby making it possible to simplify a manufacturing process and increase productivity. In addition, the impeller is made of a thermoplastic material, thereby making it possible to reduce a manufacturing cost. Further, the lower plate, the blade, and the upper blade are injection-molded integrally with each other, thereby making it possible to reduce stress concentration and improve strength of the impeller.

Although the embodiments of the present invention have been disclosed for illustrative purposes, it will be appreciated that the present invention is not limited thereto, and those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention.

Accordingly, any and all modifications, variations or equivalent arrangements should be considered to be within the scope of the invention, and the detailed scope of the invention will be disclosed by the accompanying claims. 

What is claimed is:
 1. An impeller for an electric blower comprising: an upper plate; a lower plate; and a blade positioned between the upper plate and the lower plate, wherein the lower plate includes a burring part formed at an inner diameter portion thereof to which a shaft is insertedly coupled.
 2. The impeller as set forth in claim 1, wherein the burring part is protruded so that the inner diameter portion of the lower plate into which the shaft is inserted stands up vertically toward the upper plate.
 3. The impeller as set forth in claim 1, wherein the shaft is insertedly coupled to the burring part of the lower plate, and the nut is screw-coupled to an upper end portion of the shaft so as to be positioned at an upper end portion of the burring part.
 4. The impeller as set forth in claim 1, further comprising auxiliary members positioned at an inner diameter portion of the impeller to which the shaft is coupled.
 5. The impeller as set forth in claim 4, wherein the auxiliary members are coupled to both surfaces of the lower plate, having the lower plate therebetween, and an upper surface of the auxiliary member positioned on an upper surface of the lower plate is fixed by the nut.
 6. An impeller for an electric blower comprising: an upper plate; a lower plate; and a blade positioned between the upper plate and the lower plate, wherein the lower plate includes a burring part formed at an inner diameter portion thereof to which a shaft is insertedly coupled and a washer part extended in a direction perpendicular to the burring part.
 7. The impeller as set forth in claim 6, wherein the burring part is protruded so that the inner diameter portion of the lower plate into which the shaft is inserted stands up vertically toward the upper plate, and the washer part is extended in the direction perpendicular to the burring part so as to contact the lower plate.
 8. The impeller as set forth in claim 6, wherein the shaft is insertedly coupled to the burring part of the lower plate, and the nut is screw-coupled to an upper end portion of the shaft so as to be positioned at an upper end portion of the burring part.
 9. The impeller as set forth in claim 6, further comprising auxiliary members positioned at an inner diameter portion of the impeller to which the shaft is coupled.
 10. The impeller as set forth in claim 9, wherein the auxiliary member is coupled to one surface of the lower plate facing the washer part. 